Derrick.



No. 790,04. PATENTBD MAY 16, 19015. J. H. GRAY.

DERRIGK.

APPLIoATIoN FILED FEB. 23,1905.

3 SHEETS-SHEET Attest." ,Q /l

PATENTBD MAY 16, 1905.

AJ. H. GRAY.

DERRIGK.

APPLIOATION FILED FEB. 23,1905.

3 SHEETS-SHEET 2.

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. juve-ufo@ PATENTED MAY- 16, 1905.

J.H.GRAY.

DERRIGK. 4

APPLIUATIQN FILED PEB. 23,1905.

3 SHEETS-SHEET 3.

Fatented May 16, 1905.

PATENT OFFICE. v

JOHN H. GRAY, OF VVATKINS, NEW YOR K.

\. DERICK. y

SPECIFICATION forming part of Letters Patent No. 790,048, datedfMay 16, 1905.

Application iiled February 23, 1905. Serial No. 246,844.

. To ,0l/ZZ whom, t may concern:

Be it known that I, JOHN H. GRAY, a citizen of the United States of America, residing at Watkins, county of Schuyler, and State of New York, have invented certain new and useful Improvements in Derricks, of which the following is a specification, reference being made therein to the accompanying drawings.

My invention relates to improvements in derricks vin which a plurality of booms are arranged upon a derrick-frame centrally located within the swing of the booms, so that the various strains and stresses due from the weight of the derrick are equalized, and, further, so that the weight of the loads which are to be su pported by the booms may be distributed throughout the entire structure. Undue concentrations or locaiizations of strains or pressures at a particularl point or points are obviated, and the entire strains resulting' from the use of my invention are distributed more or less equally upon widelyseparated points of support.

Another feature of my invention is that the derrick-fr'ame is so constructed in its various parts, which are ad justably secured and hinged together, that it is readily collapsible, thereby enabling the derrick frame to be raised and lowered through comparatively small openings by means of the booms.' This has an added advantageand usefulness in the construction of lofty buildings, &c., where the derr'ick must be raised from floor to floor as the work proceeds. I attain these objects by the mechanism illustrated in the accom panying drawings, in which- Figure 1 illustrates a side elevation of my improved derrick with the booms in position. Fig. 2 represents the bottom plan of the derrick-frame with the booms and triangular supports removed. Fig. 3 represents the top-plan of the derrick-frame with the several booms suspended in position.

Similar letters refer to similar parts throughout the several views.

A isthebase or bottom frame of my derrick constructed of suitable material in the form of a substantially equilateral triangle and provided with hinged loops a a a at its apices. Midway upon each of the three sides A A A is firmly secured the boom-bases D D D,

of any suitable form of construction, upon which the base of the booms F F F are adjustably secured and hinged at ci. The stretchers or braces B B B connect the 'boombases D DD, as shown in Fig. 2, and serve to strengthen the base-frame and to equalizev pressures and strains.

Six equally-inclined supports O O O, &c., are arranged so that they form when supported at their' bases at a and joined together at their tops c isosceles triangles, and these supports at'their bases hold the top frame E of the derrick, as shown in Fig. 1. The top frame E is in the form of an equilateral triangle, and the respective bases are in a directly lvertical plane over the middle part of their respective boom-bases D D D.

As shown, the supports C C C, Sac., are of equal lengthand are removably and adjustably secured to the bottom frame A at the points a a a and being hinged at e are collapsible in coacting pairs in substantial parallelism when it is desired that the structure is t0 be raised or lowered by means of the booms F F F. These booms F F F, three in number, are arranged to swing at their apices in the universal joint at CZ, and their outer eX- with the cumbrous guys and lashings now necessary to support and hold iirm derricks of this nature. It will also be seen that the various booms have an overlapping swing each with its adjoining one, so that they cover dredand forty degrees.

Having now described my invention, what I lclaim as new, and desire to secure by Letters Patent, is the following, viz:

l. In a `derrick, the combination of a triangular bottom frame supporting a triangular top frame, so that the apices of the top a combined swing of not less than iive hunframe are above the sides of the bottom trame` a plurality of booms independently supported on said top and bottom frames, and means to operate said booms, substantiallyas described.

2. In a derrick, the combination of a triangular bottom frame, a triangular top frame, collapsible supports holding said top frame, three booms independently supported on said top and bottom frames, and means to operate said booms, substantially as described.

3. In a derrick the combination ot' an equilateral triangular bottom frame, an equilateral triangular top frame, so supported that the apices of said top frame biseet in a vertical plane the sides of the bottom frame, three booms independently supported on said top and bottom frames, and means to operate said booms, substantially as described.

4;. In a derrick the combination of an cquilateral triangular bottom frame, collapsible inclined supports, an equilateral triangular top frame upon said supports, three booms independently supported on said top and bottom frames, and means to operate said booms, substantially as described.

5. In a derrick the combination of an equilateral triangular bottom frame, an equilateral triangular top frame With its sides onehaltl the length 'of the sides of said bottom frame, said top frame so supported thatits apices biseet in a vertical plane the sides of said bottom frame, three booms adjustably supported at their bases at the middle points ofthe respective sides of said bottom frame and held at their extremities by the apiccs of the top frame, and means to operate said booms, substantially as described.

6. In a del-rick, the combination of an equilatcral triangular bottom trame, collapsible inclined supports, an equilateral triangular top frame with its sides one-half the length the sides of said bottom frame upon said supports, said top frame so supported that its apices biseet in a vertical plane the sides of said bottom frame, three booms adjustably supported at their bases at the lniddle points of the respective sides of said bottom frame and held at their extremities to the apices of the top frame, and means to operate said booms, substantially as described.

7 In a derrick the combination ol an equilateral triangular bottom frame, and cquilateral triangular top frame, supports extending from the apices of one of the said triangles to those of the other and forming isosceles triangles having as basis the sides ol said equilateral triangles, booms supported at their basis at the middle points of the respective sides ot' said bottom frame and held at their extremities to the apices of the top trame, and means to operate said booms, substantially as described.

In witness whereot` l have hereunto set my hand this 20th day of I*`cbruary 1905.

JULI N H. RAY.

In presence of- EDMUND E. FluLD. Jr., FRANcis L. FIELD. 

